CN202917954U - Input under-voltage/ overvoltage protection circuit for invertion power supply - Google Patents
Input under-voltage/ overvoltage protection circuit for invertion power supply Download PDFInfo
- Publication number
- CN202917954U CN202917954U CN 201220565435 CN201220565435U CN202917954U CN 202917954 U CN202917954 U CN 202917954U CN 201220565435 CN201220565435 CN 201220565435 CN 201220565435 U CN201220565435 U CN 201220565435U CN 202917954 U CN202917954 U CN 202917954U
- Authority
- CN
- China
- Prior art keywords
- voltage
- comparator unit
- input
- input terminal
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 7
- 230000001681 protective effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an input under-voltage/ overvoltage protection circuit for an invertion power supply. The protection circuit is characterized in that the circuit is formed by connection of a voltage regulator diode D1, a comparator unit UA, and divider resistors R1, R2, R3, and R4; a negative input terminal of the comparator unit UA is connected with an invertion power supply input voltage Vin by a connection position of the divider resistor R3 to from a voltage sampling loop; a positive input terminal of the comparator unit UA is connected with a power supply Vcc by the divider resistor R1 to form an under-voltage protection point voltage reference loop; a positive input terminal of the comparator unit UA is connected with the invertion power supply input voltage Vin by the voltage regulator diode D1 to form an overvoltage protection reference point voltage loop; a positive input terminal of the comparator unit UA is grounded by the divider resistor R2; a negative input terminal of the comparator unit UA is grounded by the divider resistor R4; and an output terminal of the comparator unit UA is connected with a control signal input terminal SD of the invertion power supply. According to the utility model, the sampling circuit is arranged in the protection circuit. Moreover, the protection circuit has advantages of simple structure, a few used components, low cost, high reliability and easy realization.
Description
Technical field
The utility model relates to a kind of inverter with input undervoltage/overvoltage crowbar, belongs to the protective circuit of switch power source technical field.
Background technology:
At present, in all kinds of Switching Power Supply products, inverter particularly, because input voltage is generally the direct current that storage battery etc. provides, all can design a under-voltage/overvoltage crowbar at input, under-voltage protecting circuit prevents that on the one hand input voltage from crossing when low, and power supply and load are caused damage, preventing on the other hand that storage battery from crossing puts, and reaches the purpose of protection battery; Rely on overvoltage crowbar to prevent that voltage from surpassing the normal working voltage of inverter and causing inverter to damage.Therefore the reliability of protecting circuit designed has directly determined reliability and the fail safe of inverter.But in the prior art, overvoltage/under-voltage protecting circuit generally all adopts two sample circuits, respectively control, has that circuit structure is complicated, required spare and accessory parts are many, the high in cost of production shortcoming.
The utility model content
The purpose of this utility model is for there is the problem that circuit structure is complicated, cost is high in the overvoltage/under-voltage protecting circuit that solves above-mentioned prior art, and a kind of inverter input undervoltage/overvoltage crowbar is provided.
Carry out voltage sample by same sampled point and realize the input undervoltage overvoltage protection.
The purpose of this utility model can reach by the following technical programs:
A kind of inverter input undervoltage/overvoltage crowbar, its design feature is: be formed by connecting by voltage stabilizing didoe D1, comparator unit UA, divider resistance R1～R4; The negative input end of comparator unit UA connects the inverter input voltage vin, forms the voltage sample loop by divider resistance R3 junction, the positive input terminal of comparator unit UA connects power Vcc, forms under-voltage protection point reference voltage loop by divider resistance R1, and the positive input terminal of comparator unit UA connects the inverter input voltage vin, forms overvoltage protection datum mark voltage circuit by voltage-stabiliser tube D1; The positive input terminal of described comparator unit UA is by divider resistance R2 ground connection, and the negative input end of described comparator unit UA is by divider resistance R4 ground connection; The output of comparator unit UA connects the control signal input SD of inverter.
The purpose of this utility model can also reach by the following technical programs:
A kind of Technological improvement plan of the present utility model is: at the output of described comparator unit UA, be circumscribed with buzzer, integrated chip control input end, perhaps be circumscribed with buzzer and integrated chip control input end.
A kind of Technological improvement plan of the present utility model is: the positive input terminal of comparator unit UA connects by resistance R 1 and connects power supply VCC.
A kind of Technological improvement plan of the present utility model is: ground connection after the earth terminal of comparator unit UA is connected with the other end of the other end of R2, R4.
The beneficial effects of the utility model are:
Adopt utility model owing to adopt the inverter input voltage by the divider resistance dividing potential drop, directly obtain input comparator UA after the sampling voltage negative input end, form the single-channel sampling loop, voltage VCC is by the divider resistance dividing potential drop, as the positive input terminal of under-voltage protection point reference voltage, input comparator UA, the over-voltage protection point reference voltage is realized by the voltage that voltage stabilizing didoe D1 affects input comparator UA positive input terminal; Therefore, the utility model only has a sampling loop, has the beneficial effect that circuit is simple, the use components and parts are few, cost is lower and reliability is high, be easy to realize.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model specific embodiment 1.
Wherein, D1-voltage stabilizing didoe, UA are the integrated circuit comparator unit, R1～R4-divider resistance.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, present embodiment is formed by connecting by voltage stabilizing didoe D1, comparator unit UA, divider resistance R1～R4; The negative input end of comparator unit UA connects the inverter input voltage vin, forms the voltage sample loop by divider resistance R3 junction, the positive input terminal of comparator unit UA connects power Vcc, forms under-voltage protection point reference voltage loop by divider resistance R1, and the positive input terminal of comparator unit UA connects the inverter input voltage vin, forms overvoltage protection datum mark voltage circuit by voltage-stabiliser tube D1; The positive input terminal of described comparator unit UA is by divider resistance R2 ground connection, and the negative input end of described comparator unit UA is by divider resistance R4 ground connection; The output of comparator unit UA connects the control signal input SD of inverter.
In the present embodiment: at the output of described comparator unit UA, be circumscribed with buzzer, integrated chip control input end, perhaps be circumscribed with buzzer and integrated chip control input end.The positive input terminal of comparator unit UA connects by resistance R 1 and connects power supply VCC.Ground connection after the earth terminal of comparator unit UA is connected with the other end of the other end of R2, R4.
The operation principle of present embodiment:
With reference to Fig. 1, described circuit has three kinds of different operating states according to the size of input power Vin:
1, the inverter input voltage is by resistance R 3, R4 dividing potential drop; obtain sampling voltage; input comparator UA the 2nd pin; voltage VCC is by resistance R 1, R2 dividing potential drop; as under-voltage protection point reference voltage; input comparator UA the 3rd pin, over-voltage protection point reference voltage affect input comparator UA the 3rd pin voltage by voltage stabilizing didoe D1 to be realized.
2, the setting voltage that is higher than under-voltage protection when input voltage vin, and when being lower than the setting voltage of overvoltage protection, the 2nd pin voltage of integrated circuit comparator unit UA is greater than the reference voltage of the 3rd pin of integrated circuit comparator unit UA, the 1st pin output low level of integrated circuit comparator unit UA, protective circuit is not worked, the inverter normal operation;
3, when input voltage vin is lower than the setting voltage of under-voltage protection, the 2nd pin voltage of integrated circuit comparator unit UA is less than the reference voltage of the 3rd pin of integrated circuit comparator unit UA, the 1st pin output high level of integrated circuit comparator unit UA, protective circuit work, can be used for buzzer warning or connect the output that integrated chip Enable Pin pin removes to close this chip, in time close inverter;
When input voltage vin is higher than the setting voltage of overvoltage protection; when the setting voltage of overvoltage protection equals voltage stabilizing didoe D1 voltage of voltage regulation and comparator UA the 3rd pin input terminal voltage sum; voltage stabilizing didoe D1 reverse breakdown; along with the slowly rising of input voltage, the electric current that flows through voltage stabilizing didoe D1 becomes large.The electric current that namely flows through divider resistance R2 becomes large, and comparator UA the 3rd pin voltage raises.Although this moment, input voltage was by resistance R 3, R4 dividing potential drop, obtain sampling voltage, input comparator UA the 2nd pin also can be to a certain degree increase, but owing to the electric current change of divider resistance R2 makes greatly the amplitude of comparator UA the 3rd pin voltage increase want large, so comparator UA the 3rd pin is still greater than comparator UA the 2nd pin voltage, comparator UA the 1st pin is exported high level.Protective circuit work can be used for buzzer warning or connects the output that integrated chip Enable Pin pin removes to close this chip, in time closes inverter; Thereby realized realizing simultaneously under-voltage overvoltage protection by a sample circuit.
The utility model is to carry out voltage sample with same sampled point to realize input undervoltage/overvoltage protection, realizes that power supply and payload security move reliably.
The above only is the better specific embodiment of the utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (4)
1. an inverter is characterized in that: be formed by connecting by voltage stabilizing didoe D1, comparator unit UA, divider resistance R1～R4 with input undervoltage/overvoltage crowbar; The negative input end of comparator unit UA connects the inverter input voltage vin, forms the voltage sample loop by divider resistance R3 junction, the positive input terminal of comparator unit UA connects power Vcc, forms under-voltage protection point reference voltage loop by divider resistance R1, and the positive input terminal of comparator unit UA connects the inverter input voltage vin, forms overvoltage protection datum mark voltage circuit by voltage-stabiliser tube D1; The positive input terminal of described comparator unit UA is by divider resistance R2 ground connection, and the negative input end of described comparator unit UA is by divider resistance R4 ground connection; The output of comparator unit UA connects the control signal input SD of inverter.
2. a kind of inverter according to claim 1 is with input undervoltage/overvoltage crowbar; it is characterized in that: at the output of described comparator unit UA; be circumscribed with buzzer, integrated chip control input end, perhaps be circumscribed with buzzer and integrated chip control input end.
3. according to claim 1 can 2 described a kind of inverters with input undervoltage/overvoltage crowbars, it is characterized in that: the positive input terminal of comparator unit UA connects by resistance R 1 and connects power supply VCC.
4. described a kind of inverter is characterized in that: ground connection after the earth terminal of comparator unit UA is connected with the other end of the other end of R2, R4 with input undervoltage/overvoltage crowbar according to claim 1 and 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220565435 CN202917954U (en) | 2012-10-30 | 2012-10-30 | Input under-voltage/ overvoltage protection circuit for invertion power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220565435 CN202917954U (en) | 2012-10-30 | 2012-10-30 | Input under-voltage/ overvoltage protection circuit for invertion power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202917954U true CN202917954U (en) | 2013-05-01 |
Family
ID=48166230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220565435 Expired - Fee Related CN202917954U (en) | 2012-10-30 | 2012-10-30 | Input under-voltage/ overvoltage protection circuit for invertion power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202917954U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901270A (en) * | 2015-04-30 | 2015-09-09 | 武汉爱德威科技有限责任公司 | Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor |
-
2012
- 2012-10-30 CN CN 201220565435 patent/CN202917954U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901270A (en) * | 2015-04-30 | 2015-09-09 | 武汉爱德威科技有限责任公司 | Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204068246U (en) | A kind of low pressure drop low-power dissipation power supply protective circuit | |
| CN203707757U (en) | Overvoltage protection circuit and electronic equipment | |
| CN104218532A (en) | Voltage protection circuit for frequency converter direct current (DC) bus | |
| CN105633905A (en) | Overvoltage and under-voltage protection circuit | |
| CN204118706U (en) | A kind of multiple-channel output high reliability overvoltage crowbar | |
| CN202217486U (en) | Protection circuit, backlight module and liquid crystal display device | |
| CN203688661U (en) | Acquisition circuit for state variable of electric energy meter | |
| CN202917954U (en) | Input under-voltage/ overvoltage protection circuit for invertion power supply | |
| CN201994695U (en) | Power supply circuit | |
| CN205960624U (en) | Switch power -supply overvoltage protecting circuit | |
| CN203617680U (en) | Driving circuit and protection circuit thereof | |
| CN203415942U (en) | Fault signal processing circuit | |
| CN202856691U (en) | Control protection circuit of solid state microwave power amplifier | |
| CN205986099U (en) | Bluetooth transmission module of tape light | |
| CN205141638U (en) | Switching power supply output short circuit disconnection protection circuit | |
| CN204068684U (en) | For the current foldback circuit of power device | |
| CN205039513U (en) | High -power circuit protector against power failure of high efficiency | |
| CN203151366U (en) | Double current loop circuit for controlling output voltage pulse width | |
| CN202856324U (en) | Inverter overvoltage and under-voltage protective circuit | |
| CN205489447U (en) | Modular power exports overvoltage protector | |
| CN202797881U (en) | Power supply protection circuit module | |
| CN106300269A (en) | A kind of type voltage regulation overcurrent power-off indicating circuit | |
| CN203504139U (en) | Overvoltage protection device of water-turbine generator set | |
| CN204741259U (en) | Feeder protection equipment with power -fail protection | |
| CN206225986U (en) | A kind of voltage protection system on camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528300 Shunde, Guangdong, Daliang Industrial Park, Fengxiang, Xiang Xiang Road, No. 1 Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., LTD. Address before: 528300 Guangdong province Foshan city Shunde District Daliang Industrial Park Fengxiang Huaye Road No. 1 Patentee before: Foshan Shunde Realdesign Electronics Industry Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20181030 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |